Exchange 2013 - How do I block Internet Email to a security group while allowing local email?

I have an in-house Exchange 2013 environment.  For ease of management for the helpdesk types and auditing purposes, I have a universal distribution group that should NOT send/receive Internet email.  They can and should send/receive email within the Exchange organization.  I am thinking Transport rules to reject based on the group membership; however, it seems like it will block the ability to send and receive local email.  Am I right with that or is there a better method to perform this action?
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directpointeAsked:
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AmitIT ArchitectCommented:
Enable Require that all senders are authenticated under DG properties. This way you are blocking internet users.
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directpointeAuthor Commented:
I have used that on Exchange 2010, and that prevents incoming Internet email.  I have done that on individual users; however, it is rapidly becoming unmanageable (hence the transition to a group model).  The option to enable that isn't obvious in Exchange 2013, but I'm still looking.  It initially looks like I wouldn't receive email to the dist list, but the individual user could still receive it?

How would I prevent people on that distro group from sending email out?
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directpointeAuthor Commented:
discovered the "more options" that allow for some multiple checks (i.e. unless sender/recipient is inside the organization).
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AmitIT ArchitectCommented:
For your requirement, some testing is required. I normally use message restriction option in-built in Exchange, else you can try to configure a transport rule as per your requirement.
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directpointeAuthor Commented:
Combination of Amit's answer and digging into it a little further added a little more flavor to Amit's answer.  Thanks Amit for a very good launching point.
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